AWS Agents Run 14 Days. The Session Is the Only Wall.
AgentCore's new Instances compute type runs agents on EC2 in your own account for up to 14 days. AWS's documentation states that agents sharing an instance get no security boundary, that the platform does not verify a session ID belongs to the caller, and that the billable instances are hidden from your EC2 console by default.
August 11, 2026 · 13 min read